Otis Technology BoreBlitz with General Purpose Cleaner BoreBlitz consists of two sponges woven into the textile string, each followed by a rubber ball The first and second sponge on the BoreBlitz can be used to either double the cleaning process per stroke, or to use two different chemicals Utilize cleaning liquids such as the Otis O12 to neutralize and absorb power residues, the most destructive hazard to any barrel 1/2 ounce General Purpose Cleaner